Thanks for the fast reply....
Fresh install running Avast! antivirus, I'm confident a virus is not the issue based on this has occured over 3 installs.
Temps are all remaining in the blue as per speedfan. highest temp is GPU not going over 55C.
Safe mode doesn't seem to have the same issues, but I haven't tried gaming in safe mode.
PSU has been tested by Local shop and is brand new.
No overclocking has been done
Hard drive tested by local shop and given a clean bill of health.
Dmg and PC health check report is provided: http://dl.dropbox.com/u/351636/7-9-2011.html http://dl.dropbox.com/u/351636/SC2.rar
This one is still being uploaded. might take a few minutes to become available.